The loudest crowd I've been too was the MSG show where Raw debuted the Nickleback theme song and Kofi leg dropped on Orton through a table. However I want to point out that MSG is a very small arena. The way that place is built, it's like an amphitheater, so it's unfair to judge.
Prudential and IZOD, which I would consider to be NY crowds because you can literally see NYC from both locations, have both been dead arenas. I went to the debut HIAC PPV at the Prudential Center, crowd was not electric. Same could be said for the IZOD center which hosted this year's post mania Raw. Go back a couple months before that and check out the No Way Out PPV, the crowd was dead. As much as I hate to admit it, post WM was not the "NJ" crowd. It was the die hards of the mania crowd, very few casuals in the building.
Off Topic: The new threads bore me, so I'm bumping this old one.